Knocking and Creaking from the rear

L

LeePreston

Member
Not sure if anyone can help me.

I have a 2009 Sdrive 35i. It has developed a knocking and creaking noise from the rear. Mostly heard inside the car, and definitely at low speeds.

I’ve so far changed the springs and also the shocks (twice). We found a damaged vibration absorbers so that was also replaced.

Took it for an MOT last year hoping they’d identify it…. No luck and it passed.

I’ve got some video clips but can’t see how to upload them on here. Probably makes this post a little pointless, but it seems to be getting worse and I’m running out of ideas

Any help gratefully received.
 
Have you checked the rear bushes in the suspension?

Some people have had issues with the spring and damper not aligned and a 'clonking' sound coming from them?

Something loose in the boot well..battery..wheel brace etc?
 
When i first bought my car 9 years ago, I had knocking noise like someone hitting underside of boot with rubber mallet.
Final fix was removing right spring, washing rubbers in fairy liquid, coating in talc.
Refit then i turned spring 45 anticlockwise from from the "S1" printed on spring.

I had taken it to BMW but they couldn't fix, but i found this on internet, not a Z bulletin;
rubbers.jpg

Problem could be barrel springs pinch the rubber.
No noise since.
The usually occurred if say one rear wheel went over hump. I initially replaced the anti roll bushes with poly, that might also have helped.

I notice in the early days of the cars, a few complaints on the US Zed site.
 
Pbondar said:
Have you checked the rear bushes in the suspension?

Some people have had issues with the spring and damper not aligned and a 'clonking' sound coming from them?

Something loose in the boot well..battery..wheel brace etc?
Click to expand...

Thanks for this. I’m hoping to try and get some ideas before I go to the expense and time changing all the rear bushes.

Pretty sure it’s nothing in the boot. The knocking is accompanied by a creaking noise, also happening as soon as the car moves. But thanks for your suggestions
 
flybobbie said:
When i first bought my car 9 years ago, I had knocking noise like someone hitting underside of boot with rubber mallet.
Final fix was removing right spring, washing rubbers in fairy liquid, coating in talc.
Refit then i turned spring 45 anticlockwise from from the "S1" printed on spring.

I had taken it to BMW but they couldn't fix, but i found this on internet, not a Z bulletin;
rubbers.jpg

Problem could be barrel springs pinch the rubber.
No noise since.


The usually occurred if say one rear wheel went over hump. I initially replaced the anti roll bushes with poly, that might also have helped.

I notice in the early days of the cars, a few complaints on the US Zed site.
Click to expand...

Thanks so much for this. I had the springs replaced about two years ago after one broke. I’ve had a suspicion it might have been spring related, but both appeared to be properly seated. I’ll have another look following this bulletin

Thanks for your help
 
Squirt each bush set in sequence with silicone lube. Then drive before moving to the next set. This should identify squeaks on bushes. Always change in pairs.

That would be my first start otherwise it’s a guessing game at a great expense.
 
Hi

Did the OP find a solution?

Mine has a creaking sound at the rear when doing low speed in town. On A road or Motorway it’s silent. Suggests some kind of flexing issue is going on. Garage reported no visible broken parts

Thanks
Paul
 
Every couple of months i spray every joint and rubber seal with https://groceries.morrisons.com/products/triplewax-bumper-shine-369616011
 
flybobbie said:
When i first bought my car 9 years ago, I had knocking noise like someone hitting underside of boot with rubber mallet.
Final fix was removing right spring, washing rubbers in fairy liquid, coating in talc.
Refit then i turned spring 45 anticlockwise from from the "S1" printed on spring.

I had taken it to BMW but they couldn't fix, but i found this on internet, not a Z bulletin;
View attachment 108192

Problem could be barrel springs pinch the rubber.
No noise since.
The usually occurred if say one rear wheel went over hump. I initially replaced the anti roll bushes with poly, that might also have helped.

I notice in the early days of the cars, a few complaints on the US Zed site.
Click to expand...
Hi
Sorry it’s late but just got same problem
Where should the S1 face please.
Mine currently faces to the rear of the car
 
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